为了保护眼睛，决定把白色背景换掉：
1 首先，在已经下载好的python文件目录下，找到config-highlight.def文件，我的是在H:\python\python3**\Lib\idlelib**文件夹下。
2.打开文件后，你会看到一些默认的颜色配置，比如经典的颜色配置就是白色背景，一般这个文件中会有两种配置可供选择：
[IDLE Classic]和
[IDLE New]，表现在IDLE界面上就是在python shell下，选择options—configure IDLE—-highlighting选项中，右侧的highlighting theme主题选择，有两种可选方案，就上文件中的那两种。
3.如果直接在源文件上修改颜色有些麻烦，除非你特别熟悉颜色。网上有经典的背景配置：
[Obsidian]
definition-foreground = #678CB1
error-foreground = #FF0000
string-background = #293134
keyword-foreground = #93C763
normal-foreground = #E0E2E4
comment-background = #293134
hit-foreground = #E0E2E4
builtin-background = #293134
stdout-foreground = #678CB1
cursor-foreground = #E0E2E4
break-background = #293134
comment-foreground = #66747B
hilite-background = #2F393C
hilite-foreground = #E0E2E4
definition-background = #293134
stderr-background = #293134
hit-background = #000000
console-foreground = #E0E2E4
normal-background = #293134
builtin-foreground = #E0E2E4
stdout-background = #293134
console-background = #293134
stderr-foreground = #FB0000
keyword-background = #293134
string-foreground = #EC7600
break-foreground = #E0E2E4
error-background = #293134
[tango]
definition-foreground = #fce94f
error-foreground = #fa8072
string-background = #2e3436
keyword-foreground = #8cc4ff
normal-foreground = #ffffff
comment-background = #2e3436
hit-foreground = #ffffff
break-foreground = #000000
builtin-background = #2e3436
stdout-foreground = #eeeeec
cursor-foreground = #fce94f
hit-background = #2e3436
comment-foreground = #73d216
hilite-background = #edd400
definition-background = #2e3436
stderr-background = #2e3436
break-background = #2e3436
console-foreground = #87ceeb
normal-background = #2e3436
builtin-foreground = #ad7fa8
stdout-background = #2e3436
console-background = #2e3436
stderr-foreground = #ff3e40
keyword-background = #2e3436
string-foreground = #e9b96e
hilite-foreground = #2e3436
error-background = #2e3436直接把上面的代码copy到刚才打开的config-highlight.def文件中，然后重启shell就可以。
重启后，shell会默认选择原来的。你就在highlighting theme主题中查看，此时已经多了两种主题，就是你刚才添加的。 
主题名字为tango..
大功告成。。
字体的修改
在setting中，如果你设置的字体是中文字体，再怎么修改大小也是没有用的。必须把字体改为英文字体才行。。 